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London-born Cushnie, 28, has been dressing America's First Lady Michelle Obama in her Cushnie et Ochs label while
Nasty Gal
founder Sophia Amoruso's worth has been estimated at $250 million thanks to the directional but affordable website she founded six years ago.

Also listed in the 'Art & Style' category are designers Joseph Altuzarra (a rising star at New York Fashion Week); Sally LaPointe (beloved of Lady Gaga) and Brazilian Pedro Lourenço, who is just 22 years old and first showed at Paris Fashion Week aged 19.

Household names Ashley and Mary-Kate Olsen - the child TV stars who head up several fashion ventures including The Row and Elizabeth & James - also feature, as does Alexander Wang, who was recently confirmed as the new creative director of Balenciaga.

24-year-old Leandra Medine has proved that a computer and a sense of humour can impact on millions: her blog Man Repeller, which puts clothes the opposite sex can't fathom in the spotlight, has earned her site over 2.6 million page views a month.